See also: Comet in Pictorial Dictionary of Heraldry.
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A moving star with a tail, called a beard. If inverted may be blazoned a "shooting star."
Default alignment: palewise, tail to base. No proper coloration.
The estoile may have a a different tincture than its beard but this would be considered a Step From Core Practice (SFCP).
Comet (4) §
This variety, with a straight tail, is found in Italian armory.
Source: Insignia Nobilium Patavinorum. Artist unknown. (Arms of Beneditti, folio 65r.)